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Now support both reading and writing for png and bitmap images
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Cleaning up code so its ready for release
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It finally works now
Definitely some clean up to be done
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Currently writes IHDR and IEND chunks correctly
CRC implementation is borrowed from the specification
Writer class now also has a buffer for the CRC calculation
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Also moved both the reader and writer class to the same files, named
files.{cpp,h}
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Rows in a bitmap are now padded to be a multiple of 4 bytes long
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Implemented padding scalines to 4 bytes if they aren't already that
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Also improved error handling slightly
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This is so I can test PNG writing by reading a BMP and writing it to a
PNG, effectively the reverse of the PNG reading testing
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Currently not incredibly well implemented, but it can handle fixed
codes
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The file reader class can now support either endianness to read in,
and will convert to the native endianness
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All functions and classes are now behind the cpp namespace `TehImage`
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Had to restrict images to 8 bit depth sadly
This could potentially be changed in the future by setting bit depth
with templates and changing the data to be the specified bit depth
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the average filter method
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Mainly just cleaning up code
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Also added the bitmap image subclass
note: this is pretty hacky in how it works
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Changed it to GNUmakefile because it uses GNU make only features
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Bringing a lot of stuff over from my maze-reader project in an attempt
to split the image reading code off into a library.
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